Bump react-router and react-router-dom in /frontend
Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) to 7.6.0 and updates ancestor dependency [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom). These dependencies need to be updated together.
Updates react-router
from 7.5.0 to 7.6.0
Updates react-router-dom
from 7.5.0 to 7.6.0
---
updated-dependencies:
- dependency-name: react-router
dependency-version: 7.6.0
dependency-type: indirect
- dependency-name: react-router-dom
dependency-version: 7.6.0
dependency-type: direct:production
...
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